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I rewrote PostHog's SQL parser, 70x faster, while barely looking at the code

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I rewrote PostHog's SQL parser, 70x faster, while barely looking at the code
✦AI Summary

A developer successfully rewrote PostHog's SQL parser to be 70x faster by utilizing AI-assisted coding sessions. The project involved generating thousands of lines of code and tests with minimal manual intervention.

Why it matters

This demonstrates the growing capability of AI agents to handle complex, large-scale software engineering tasks, potentially revolutionizing development workflows.

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I wrote a 70x faster SQL parser while barely looking at the code Robbie Coomber Jun 24, 2026

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The article is a technical case study written by the developer, focusing on methodology and results.

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